有机碳含量是评价烃源岩优劣的重要指标。本文以合水地区延长组富有机质页岩为研究对象,以研究层段实测TOC值为基础,采用电阻率测井方法,根据多元回归分析的方法建立TOC与电阻率对数、自然伽马三者的数学模型。根据建立的模型对庄50井、宁70井TOC实测点与预测点误差分析显示,误差率为3.1%;运用模型对未实测井段进行TOC计算并画出长7段TOC平面分布分析,发现与长6段油藏有利区叠合度高,从侧面证明了该模型的有效性,可以在该地区推广运用。
This paper sets up a mathematic model of TOC, resistivity log and natural gamma by means of multivariate regression analysis. And this model is applied to the logging interpretation of organic carbon of the Yanchang Formation of Zhuang-50 and Ning-70 wells in the Heshui Region, Ordos Basin. The results show validity of the model.